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Vulnerability record · CVE-2026-40304 · published 17 April 2026

CVE-2026-40304: Netfoundry zrok improper access control vulnerability

Netfoundry · Zrok

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the unaccess handler (controller/unaccess.go) contains a logical error in its ownership guard: when a frontend record has environment_id = NULL (the marker for admin-created global frontends), the condition short-circuits to false and allows the deletion to proceed without any ownership verification. A non-admin user who knows a global frontend token can call DELETE /api/v2/unaccess with any of their own environment IDs and permanently delete the global frontend, taking down all public shares routed through it. Version 2.0.1 patches the issue.

5.3 CVSS 3.1 Medium EPSS 0.36% · top 73.0% CWE-284 · Improper access controlCWE-863 · Incorrect authorization
5.3CVSS 3.1 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the unaccess handler (controller/unaccess.go) contains a logical error in its ownership guard: when a frontend record has environment_id = NULL (the marker for admin-created global frontends), the condition short-circuits to false and allows the deletion to proceed without any ownership verification. A non-admin user who knows a global frontend token can call DELETE /api/v2/unaccess with any of their own environment IDs and permanently delete the global frontend, taking down all public shares routed through it. Version 2.0.1 patches the issue.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/openziti/zrok/releases/tag/v2.0.1 Release Notes
https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-40304), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.